Hello Vapi Support Team, I've been trying to use the call control feature to programmatically end calls in my backend application at the webhook. However, when I tried to end a call using the call control URL and passed the type endCall, I encountered an error stating that the type must be one of the following values: add-message, control, say, transfer, transcriber-response. Could you please help me understand how to correctly end a call programmatically using your API? Is there a specific command or parameter I should use? Thank you for your assistance.